Heavy rocking base



FIG. 1 is a top, front isometric view of a heavy rocking base showing mynew design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof, the rear and sideelevational views thereof being the same; and,

FIG. 4 is a bottom plan view thereof.

The ornamental design for a heavy rocking base, as shown and described.